以草酸亚铁(FeC2O4·2H2O)、硫粉(S)、气相生长的碳纤维(VGCF)为原料,通过固相法合成了锂离子电池材料FeS2/VGCF.采用X射线衍射(XRD)、扫描电镜(SEM)、循环伏安(CV)和恒流充放电循环等方法对合成材料的结构、形貌以及电化学性能进行了表征.结果表明:合成的二硫化亚铁材料呈条块状.在1.0～2.6 V(vs Li/Li+)电压范围内,以0.1C(1C=890 mA/g)倍率进行恒电流充放电,FeS2与FeS2/VGCF的放电容量分别为692、872 mAh/g,在0.5C倍率下,经过50、100、200次循环后纯FeS2的放电比容量分别为268、71、28 mAh/g,而FeS2/VGCF的放电比容量可分别保持在469、417、254 mAh/g,较之无VGCF修饰的FeS2材料表现出良好的倍率性能和循环性能.
参考文献
| [1] | Strauss E,Ardel G,Livshits V,et al.Lithium polymer electrolyte pyrite rechargeable battery:comparative characterization of natural pyrite from different sources as cathode material.J.Power Sources,2000,88(2):206-218. |
| [2] | Peled E,Golodnitsky D,Strauss E,et al.Li/CPE/FeS2 rechargeable battery.ElectrochimActa,1998,43(10/11):1593-1599. |
| [3] | Zhang D,Tu J P,Xiang J Y,et al.Influence of particle size on electrochemical performances of pyrite FeS2 for Li-ion batteries.Electrochimca Acta,2011,56(27):9980-9985. |
| [4] | Ennaoui A,Fiechter S,Goslowsky H,et al.Photoactive synthetic polycrystalline pyrite (FeS2).J..Electrochem.Soc.1985,132(7):-1579-1582. |
| [5] | Wu R,Zheng Y F,Zhang X G,et al.Hydrothermal synthesis and crystal structure of pyrite.J.Cryst Growth,2004,266(4):523-527. |
| [6] | Feng X,He X M,Pu W H,et al.Hydrothermal synthesis of FeS2 for lithium batteries.Ionics,2007,13(5):375-377. |
| [7] | Chen X H,Fan R.Low-temperature hydrothermal synthesis of transition metal dichalcogenides.Chem.Mater.,2001,13 (3):802-805. |
| [8] | Gao P,Xie Y,Ye L.N,et al.From 2D nanoflats to 2D nanowire networks:A novel hyposulfite self-decomposition route to semiconductor FeS2 nanowebs.Cryst.Growth Des.,2006,6(2):583-587. |
| [9] | Wang D W,Wang Q H,Wang T M.Controlled growth of pyrite FeS2 crystallites by a facile surfactant-assisted slvothermal method.Ryst.Eng.Comm.,2010,12(3):755-761. |
| [10] | Wang D W,Wu M H,Wang Q H,et al.Controlled growth of uniform nanoflakes-built pyrite FeS2 microspheres and their electrochemical properties.Ionics,2011,17(2):163-167. |
| [11] | Rosamada F,Dahn J R,Jones C H W.Electrochemistry of pyritebased cathodes for ambient temperature lithium batteries.J.Electrochem.Soc.,1989,136(11):3206-3210. |
| [12] | Choi Y J,Kim N W,Kim K W,et al.Electrochemical properties of nickel-precipitated pyrite as cathode active material for lithium/pyrite cell.J.Alloys Compd.,2009,485(1):462-466. |
| [13] | Huang S Y,Liu X Y,Li Q Y,et al.Pyrite film synthesized for lithiumion batteries.J.Alloys Compd,2009,472(1):L9-L12. |
| [14] | Zhang D,Mai Y J,Xiang J Y,et al.FeS2/C composite as an anode for lithium ion batteries with enhanced reversible capacity.J.Power Sources,2012,217:229-235. |
| [15] | Egashira M,Itoh M,Tokita M,et al.Preparation and capacitor performance of composites based on mesoporous carbon/nanofibrous carbons.TANSO,2011 (246):6-10. |
| [16] | Duan H,Zheng Y F,Dong Y Z,et al.Pyrite (FeS2) films prepared via sol-gel hydrothermal method combined with electrophoretic deposition (EPD).Mater.Res.Bull.,2004,39(12):1861-1868. |
| [17] | Duan H,Zheng Y F,Zhang X G,et al.Hydrothermal synthesis of iron pyrite (FeS2) crystalpowder and thermal-kinetic study on crystal growth.Acta Physica Sinica,2005,54(4):1659-1664. |
| [18] | Zheng X D,Dong C C,Huang B,et al.Effects of conductive carbon on the electrochemical performances of Li4Ti5O12/C composites.J.Electrochem.Sci.,2012,7:9869-9880. |
| [19] | Hansen K,West K.Lithium insertion into iron sulfides.Electrochem.Soc.Proc.,1997,97(18):124-132. |
| [20] | Strauss E,Golodnitsky D,Peled E.Elucidation of the charge-discharge mechanism of lithium/polymer electrolyte/pyrite batteries.J.Solid State Electrochem.,2002,6(7):468-474. |
| [21] | Montoro L A,Rosolen J M.Gelatin/DMSO:a new approach to enhancing the performance of a pyrite electrode in a lithium battery.SolidState Ionics,2003,159(3):233-240. |
| [22] | Montoro L A,Rosolen J M,Shin J H,et al.Investigations of natural pyrite in solvent-flee polymer electrolyte,lithium metal batteries.Electrochim.Acta,2004,49(20):3419-3427. |
| [23] | Choi Y J,Chung Y D,Baek C Y,et al.Effects of carbon coating on the electrochemical properties of sulfur cathode for lithium/sulfur cell.J.Power Sources,2008,184(2):548-552. |
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